ASTM D869-2021 pdf free download

ASTM D869-2021 pdf free download.Standard Test Method for Evaluating Degree of Settling of Paint
1. Scope
1.1 This test method covers the determination of the degree of pigment suspension and ease of remixing a shelf-aged sample of paint to a homogeneous condition suitable for the intended use. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Significance and Use
3.1 Paints, if not formulated or processed properly may settle excessively. Paint that settles excessively is difficult to reincorporate into the paint system causing time delays or valuable pigment being left in the drum. This test method is an attempt to evaluate the degree of settling caused by the accelerated Test Method D1309. This very subjective method of evaluation in conjunction with the variables of Test Method D1309 raises questions as to the usefulness of the results for specification compliance.
4. Apparatus
4.1 Container, standard 500-mL (1-pt) friction-top can paint container, 85.5 6 1.5 mm (3 3 ⁄ 8 6 1 ⁄ 16 in.) in diameter, and 98.5 6 1.5 mm (3 7 ⁄ 8 6 1 ⁄ 16 in.) in height. 4.2 Spatula, stainless-steel blade with a handle with a 127 mm (5 in.) long blade and approximately 20 mm ( 13 ⁄ 16 in.) in width. Approximately 2 mm of the end shall be cut off such that the end is square. For comparative testing it is recom- mended to use the indicated spatula parameters as variances may show different results. Other specifications may be accept- able and should be decided on between purchaser and seller.
5. Procedure
5.1 Place the specimen to be tested for pigment suspension in a 500-mL (1-pt) container, filling the can to within 13 mm ( 1 ⁄ 2 in.) of the top. Close the can tightly and hold undisturbed for shelf aging for 6 months or for such other periods of time agreed upon between the purchaser and the seller. 5.2 Open the can holding the shelf-aged sample without shaking or agitation, and examine the sample without removal of supernatant vehicle. Use the spatula to determine the extent and character of portions of the paint that may have separated during storage. Hold the spatula perpendicular to and in the center area of the paint at a height whereby the bottom edge of the spatula is level with the top of the can. Drop the spatula from that position. Rate the condition of the sample in accordance with 5.4.5.3 After examination ofthe entire specimen as described in 5.2, ifa portion ofthe pigment has separated out to form a firm cake at the bottom ofthe container pour the supernatant portion of the liquid off into a clean container and hold for subsequent use. Reincorporate the separate cake by hand stirring with the spatula, adding back the liquid in small amounts until the pigment has been reincorporated to form a homogeneous paint suitable for the intended use or until it is determined that the pigment cake cannot be reincorporated by hand stirring. Rate the condition of the specimen in accordance with 5.4.
6. Precision and Bias
6.1 Precision—Due to the poor precision of this test method, if it is used in a specification, the maximum deviation from the settling limits specified should be agreed upon between the purchaser and the seller. 6.2 Bias—Bias cannot be determined.